passage vs passageway

passage and passageway both are nouns.

Word	Noun	Adjective	Verb	Adverb
passage	Yes	No	No	No
passageway	Yes	No	No	No

As nouns, passageway is a hyponym of passage; that is, passageway is a word with a more specific, narrower meaning than passage:

Other hyponyms of passage include adit, aisle, channel, conduit, cul, cul de sac, dead end, fish ladder, right of way, shaft, throat.

As nouns, passage and passageway are synonyms defined as:

passage and passageway: a path or channel or duct through or along which something may pass

passage (noun)	passageway (noun)
a journey usually by ship	a passage between rooms or between buildings
the passing of a law by a legislative body	a path or channel or duct through or along which something may pass
the act of passing something to another person
the act of passing from one state or place to the next
a bodily reaction of changing from one place or stage to another
a way through or along which someone or something may pass
a path or channel or duct through or along which something may pass
a section of text; particularly a section of medium length
a short section of a musical composition
the motion of one object relative to another